Method of manufacturing thin metal sheets.



No. 731,732. PATENTED JUNE 23-, I903. T. V. ALLIS.

METHOD OF MANUFACTURING THIN METAL SHEETS. APPLIOATION rmnn MAY 14. 1002.

N0 MODEL.

Witnesses [mentor M57, I A @MMEQWW .Jzwrneys m: mums rams co. PHOTQLITHD,WASHINGTON, n4 2:.

Patented June 23, 1903.

PATENT OFFICE.

THOMAS V. ALLIS, OF BRIDGEPORT, CONNECTICUT.

X METHOD, OF MANUFACTURING THIN METAL SHEETS.

SPECIFICATION forming part of Letters Patent No. 7 31 ,732, dated June 23, 1903. Application filed May 14,1902. Serial No. 107,343. (No model.)

To all whom-it mag concern:

Be it known that THoMAsv. Arms, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Methods of Manufacturing Metal Sheets, of which the following is a specification.

My invention is an improvement in the art of manufacturing black-plate and similar 7 I sheets of iron, steel, or othermetals, and is designed to cheapen their production.

The invention will be more readily understood by reference to the accompanying drawings, in which the several figures (numbered 1 to 6) represent the various stages of the process.

In preparing the plates from which the piles are formed the ingot lis preferably rolled before it has lost its casting heat into long plates 2, Fig. 2, of three-sixteenths of an inch in thickness, more or less, and the desired hot, as this operation width. These plates are then divided crosswise into sections 3, Fig. 2, the length of the sections being approximately the width of the packs to be rolled therefrom. These plates or sections 3 are reduced still. thinner preparatory to their final rolling in packs in one of three ways, first, after heating by rolling them as thin as is economical in a pile, as at 4, Fig. 3; or said plates after being heated may be roughed singly, matched, and

plates in a pack must now be increased to give a final pack of sufficient thickness to permit The first step in reduction to thin sheets.

' this direction is to match a pair of these plates,

as at 5, Fig. 3, and fold them back upon themselves, thus producing pack 6, Fig. 4, containing double thenurnber of layers of plates.

A prominent feature of this invention is the, coating of the plates comprising a pack with a material which will prevent undue adhesion during their reduction.

. which best fulfils this requirement is talc in some of its varied forms. The coating mate- The material rial in a finely-divided state is applied to the surface of the plates to be reduced either as a dry powder or in the form of a painter Wash. It now becomes necessary to separate the doubled packs into individual plates for convenience in applying the material. To accomplish this, the folded or curled end of a pack 7, Fig. 4., is sheared off, which separates the pack into individual sections 8 of practically the same length. The same result may be elfected without folding the pack by severing it transversely at its center. There is now a number of plates which are covered with a thin film of the material above referred to. This material is of such nature that it adheres loosely to the plates andis easilydisplaced if the sheets shift oneach other. and expose the coatings .to contact as the packs are handled during the process of manufacture. To prevent this shifting and preserve the thin even coating on all of the contact-surfaces of the plates in the pack and to give a pack having twice the number of layers of plates, the pack is folded back upon itself, producing the final pack 9, Fig. 5, of the requisite thickness for further reduction. Pack 9 is then heated and rolled to a finish, giving a product 10, Fig. 6, containing sheets of the required thickness.

While the method above described for producing the plates to be coated and doubled into packs for. final reduction is both practical and economical, other meansmay be employed-as, for example, thosefollowed in rolling skelp, nail-plate, shovel-steel, and like material.

Having thus described my invention, I claim The method'of producing black-plate and similar metal sheets, which consistsincoating metal plates with a material to prevent undue adhesion during their reduction, assembling them in a pack,-folding'the pack back upon itself to protect the coatin'gs,heating said pack and reducin'gnitwhilehot, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS ALLIS.

WVitnesses:

EUGENE A. BYRNES, CLINTON P. TOWNSEND. 

